sectional density's effect on bullet performance

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by sscoyote, Aug 2, 2003.

1. sscoyoteWell-Known Member

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sectional density\'s effect on bullet performance

I know that it is interrelated with B.C., but I'm not sure what the difference is, and it's application to LR??

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3. MAXWell-Known Member

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Re: sectional density\'s effect on bullet performance

sscoyote, SD or sectional density is a measure of mass to cross section of a projectile. For a given caliber, higher SD means greater penetration IF ALL OTHER THINGS ARE EQUAL.

SD is used to calculate ballistic coefficient(BC). BC is a measure of how well a projectile retains velocity in comparison to a standard projectile. Any number less than 1 means it retains less velocity at a given range, 1 is equal, and more than 1 denotes more retained velocity. Another way of looking at it is that it reflects a bullet's drag characteristics.

In calculating BC, the bullet's FORM is considered in relation to SD, which presents a NON-DIMENSIONAL value for comparison. BC for a given form is directly proportional to SD.

Try "Understanding Firearm Ballistics" by Robert Rinker. It is a cheap and time saving education, which cover interior/exterior and terminal ballistics. Luck.

4. sscoyoteWell-Known Member

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Re: sectional density\'s effect on bullet performance

Thks. guys